Gravity self-deashing environment-friendly structure of carbon black tail gas boiler

Abstract

The invention discloses a carbon black tail gas boiler gravity self-deashing environment-friendly structure which comprises a low-temperature plate type economizer, a communicating flue and an air preheater, the communicating flue is in an inverted-U shape, the low-temperature plate type economizer and the air preheater are communicated through the inverted-U-shaped communicating flue to form a relatively independent space, and the low-temperature plate type economizer is of a plate type light pipe structure. The plate-type light pipe structure comprises a plurality of groups of heat exchange units, each heat exchange unit is a pipe panel formed by a plurality of rows of coiled pipes connected in parallel, the pipe panels are arranged in sequence, the pipe panels adopt a large-pitch design, and the pitch between the pipe panels is 100mm; the problem that the tail heating surface of the carbon black tail gas boiler is prone to dust accumulation and blockage is solved, the corrosion condition of the tail heating surface is improved, the service life of a low-temperature economizer and an air preheater is prolonged, the heat transfer efficiency of the heating surface is guaranteed, fan energy consumption is reduced, the stable operation period of the boiler is prolonged, and the blowing-out overhaul and dust removal frequency is reduced. Not only can cost reduction and benefit increase be realized, but also energy conservation and environmental protection are realized.

Description

Technical Field

[0001] This invention relates to the field of carbon black tail gas boiler technology, and in particular to a gravity self-cleaning environmentally friendly structure for carbon black tail gas boiler. Background Technology

[0002] With the rapid development of my country's carbon black industry, the increasing demand for carbon black, and increasingly stringent environmental protection measures, the demand for carbon black tail gas boilers will continue to grow. In order to meet environmental protection requirements and increase the efficiency of enterprises, the gravity self-cleaning environmentally friendly structure of carbon black tail gas boilers is an important means for the carbon black boiler industry to solve problems such as blockage of the tail heating surface in the future.

[0003] Traditionally, low-temperature economizers in carbon black tail gas boilers use finned economizers, and air preheaters are vertical. After a period of operation, blockages occur in the economizer and air preheater tubes, severely impacting boiler operating time and efficiency. Blockages in the heating surfaces easily lead to corrosion and tube rupture, requiring frequent component replacements. Severe blockages necessitate increased blower and induced draft fan power, and in some cases, boiler shutdown for maintenance and high-pressure water jet cleaning, resulting in significant economic losses. The short replacement cycle and high cost of the tail-end heating surfaces, coupled with prolonged boiler shutdowns, reduce the company's economic efficiency. Therefore, adopting a gravity-driven self-cleaning environmentally friendly structure for carbon black tail gas boilers will be an effective solution to these problems in the future. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems existing in the prior art and to provide an environmentally friendly structure for a carbon black tail gas boiler with gravity self-cleaning ash removal.

[0005] To achieve the above objectives, the technical solution provided by this invention is: a gravity self-cleaning environmentally friendly structure for a carbon black tail gas boiler, comprising a low-temperature plate economizer, a connecting flue, and an air preheater. The connecting flue is inverted U-shaped. The low-temperature plate economizer and the air preheater are connected through the inverted U-shaped connecting flue to form relatively independent spaces. The low-temperature plate economizer adopts a plate-type bare tube structure, which includes multiple heat exchange units. Each heat exchange unit is composed of multiple rows of parallel serpentine tubes forming a tube screen. The tube screens are arranged in sequence and have a large pitch design, with a pitch of 100mm between the tube screens.

[0006] Preferably, the air preheater is a horizontal air preheater, the heat exchange tubes of the air preheater are arranged in parallel, and the heat exchange tubes are designed with a large pitch, with the pitch between the heat exchange tubes being 80-90mm.

[0007] Preferably, the lower part of the inverted U-shaped connecting flue is provided with a slag discharge port.

[0008] Preferably, the flue gas flowing through the low-temperature plate economizer is the flue gas after being denitrified by the SCR denitrification device.

[0009] Beneficial effects of this invention: This invention effectively solves the problem of easy ash accumulation and blockage on the tail heating surface of carbon black tail gas boilers, improves the corrosion condition of tail heat exchange tubes, increases the service life of low-temperature economizers and air preheaters, ensures the heat transfer efficiency of heat exchange tubes, reduces fan energy consumption, extends the stable operation cycle of boilers, reduces the frequency of shutdown for maintenance and ash cleaning, and provides users with higher quality and more reliable products. It not only reduces costs and increases efficiency, but also achieves energy saving and environmental protection. Attached Figure Description

[0010] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0011] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention; Figure 2 This is an enlarged schematic diagram of the structure at point A of the present invention.

[0012] Attached image captions: 1-Plate-type low-temperature economizer, 2-Connecting flue, 3-Air preheater. Detailed Implementation

[0013] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0014] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0015] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0016] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0017] Reference Figures 1-2 According to a preferred embodiment of the present invention, a gravity self-cleaning environmentally friendly structure for a carbon black tail gas boiler includes a low-temperature plate economizer 1, a connecting flue 2, and an air preheater 3. The connecting flue 2 is inverted U-shaped. The low-temperature plate economizer 1 and the air preheater 3 are connected by the inverted U-shaped connecting flue 2 to form relatively independent spaces. The low-temperature plate economizer 1 adopts a plate bare tube structure. The plate bare tube structure includes multiple heat exchange units. The heat exchange unit is composed of multiple rows of parallel serpentine tubes forming a tube screen. The tube screen is arranged in sequence and adopts a large pitch design. The pitch between the tube screens is 100mm.

[0018] Furthermore, the air preheater 3 is a horizontal air preheater, and the heat exchange tubes of the air preheater 3 are arranged in parallel, and the heat exchange tubes adopt a large pitch design, with a pitch of 80-90mm between the heat exchange tubes.

[0019] Furthermore, a slag discharge port is provided at the lower part of the inverted U-shaped connecting flue 2.

[0020] In this embodiment, the flue gas flowing through the low-temperature plate economizer 1 is the flue gas after being denitrified by the SCR denitrification device.

[0021] Working principle of the invention: After the flue gas passes through the SCR denitrification device, the generated ammonium sulfate and ammonium bisulfate will flow with the flue gas to the low-temperature economizer 1; The low-temperature economizer 1 abandoned the original spiral fin tube screen and adopted a plate-type bare tube structure. The original staggered arrangement was changed to a smooth arrangement, and the pitch between the tube screens was increased (100mm). The blockage will flow through the gap between the tubes (avoiding the blockage problem) into the inverted U-shaped connecting flue 2. The blockage is in the form of lumps, while the rest of the flue gas is floating ash. The two have different specific gravities. Under the influence of gravity and with a reasonable flue gas velocity, the blockage will gradually settle into the inverted U-shaped connecting flue duct 2. The lower part of the inverted U-shaped connecting flue duct 2 is equipped with a slag discharge port, through which the blockage can be cleaned. The floating ash will continue to move forward with the flue gas and flow to the air preheater. The air preheater 3 here also adopts a horizontal, parallel, large-pitch structure. Compared with the original vertical, staggered, flue gas pipe arrangement, it effectively solves the problem of air preheater blockage and ensures the normal operation of the tail heating surface.

[0022] This invention is applicable to the cleaning of the tail heating surface of carbon black tail gas boilers. It fully matches the characteristics of the flue gas, adjusts the reasonable structural form, and relies on the flushing of flue gas and the weight of the ash to achieve cleaning without the intervention of auxiliary equipment. Furthermore, when the boiler is running, the ash removal effect is better when combined with online shock wave, steam, and shock wave soot blowing. Among them, the low-temperature economizer 1 and the horizontal air preheater are connected by an inverted U-shaped connecting flue 2 to form a relatively independent space. This prevents the ash accumulated in the low-temperature economizer 1 from piling up on the air preheater 3 when it falls, thus preventing the air preheater 3 from becoming clogged. Moreover, the ash is removed in time through the ash discharge port at the bottom of the inverted U-shaped connecting flue 2, which greatly improves the ash accumulation condition of the air preheater 3.

[0023] This invention can solve the blockage problem caused by ammonium bisulfate adhering to the tubes of the low-temperature economizer 1 and the air preheater 3, extend the replacement cycle of the heat exchange tubes, and improve the service life of the air preheater 3; reduce the boiler downtime caused by blockage during non-maintenance periods, improve the economic benefits of enterprises, and save costs; in addition, this invention has a simple and reliable structure, is easy to operate, and is economical and practical.

[0024] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0025] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means is within the protection scope of the present invention.

Claims

1. A gravity-driven self-cleaning environmentally friendly structure for carbon black tail gas boilers, characterized in that: It includes a low-temperature plate economizer, a connecting flue, and an air preheater. The connecting flue is inverted U-shaped. The low-temperature plate economizer and the air preheater are connected by the inverted U-shaped connecting flue to form relatively independent spaces. The low-temperature plate economizer adopts a plate bare tube structure. The plate bare tube structure includes multiple heat exchange units. The heat exchange unit is composed of multiple rows of parallel serpentine tubes forming a tube screen. The tube screen is arranged in sequence and adopts a large pitch design. The pitch between the tube screens is 100mm.

2. The environmentally friendly gravity self-cleaning structure for a carbon black tail gas boiler according to claim 1, characterized in that: The air preheater is a horizontal air preheater. The heat exchange tubes of the air preheater are arranged in parallel and have a large pitch design, with a pitch of 80-90mm between the heat exchange tubes.

3. The environmentally friendly gravity self-cleaning structure for a carbon black tail gas boiler according to claim 1, characterized in that: The inverted U-shaped connecting flue has a slag discharge port at the bottom.

4. The environmentally friendly gravity self-cleaning structure for a carbon black tail gas boiler according to claim 1, characterized in that: The flue gas flowing through the low-temperature plate economizer is the flue gas after being denitrified by the SCR denitrification device.

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